> 12-15K feet just isn’t that high in the scheme of things. Many peaks in the western US are in that range or more.

It's "not that high", but people frequently do get AMS at those attitudes or even lower.

There's a big difference between doing a day trip to those altitudes which is normally ok, and sleeping that high which causes problems if not acclimatised.

	▲	chimeracoder 2 hours ago \| parent [-]
		> There's a big difference between doing a day trip to those altitudes which is normally ok, and sleeping that high which causes problems if not acclimatised. I'm not sure what point you're trying to make. People regularly experience AMS at the heights far below what OP mentioned, whether on the day they arrive or on days 2-4, and that's not even accounting for strenuous physical activity.

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ghaff 6 hours ago | parent | prev [-]

I can’t provide cites but I understand people have had issues flying into Denver.